change Pango-based ui.text backend (move all util words from pango and pango.cairo vocabularies to ui.text.pango)
Anton Gorenko
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d94cb7543d
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be272a0bde
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@ -1,10 +1,180 @@
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! Copyright (C) 2009, 2010 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: accessors assocs cache kernel math math.vectors
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namespaces pango pango.cairo ui.text ui.text.private
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sequences ;
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USING: accessors alien.c-types alien.strings arrays assocs cache cairo
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cairo.ffi classes.struct combinators destructors fonts fry
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init io.encodings.utf8 kernel math math.rectangles math.vectors
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memoize namespaces sequences ui.text ui.text.private
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gobject gobject.ffi pango pango.ffi pango.cairo pango.cairo.ffi ;
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IN: ui.text.pango
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: pango>float ( n -- x ) PANGO_SCALE /f ; inline
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: float>pango ( x -- n ) PANGO_SCALE * >integer ; inline
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MEMO: (cache-font-description) ( font -- description )
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[
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[ pango_font_description_new |pango_font_description_free ] dip {
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[ name>> utf8 string>alien pango_font_description_set_family ]
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[ size>> float>pango pango_font_description_set_size ]
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[ bold?>> PANGO_WEIGHT_BOLD PANGO_WEIGHT_NORMAL ? pango_font_description_set_weight ]
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[ italic?>> PANGO_STYLE_ITALIC PANGO_STYLE_NORMAL ? pango_font_description_set_style ]
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[ drop ]
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} 2cleave
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] with-destructors ;
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: cache-font-description ( font -- description )
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strip-font-colors (cache-font-description) ;
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TUPLE: layout < disposable font string selection layout metrics ink-rect logical-rect image ;
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SYMBOL: dpi
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72 dpi set-global
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: set-layout-font ( font layout -- )
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swap cache-font-description pango_layout_set_font_description ;
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: set-layout-text ( str layout -- )
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swap utf8 string>alien -1 pango_layout_set_text ;
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: PangoRectangle>rect ( PangoRectangle -- rect )
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[ [ x>> pango>float ] [ y>> pango>float ] bi 2array ]
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[ [ width>> pango>float ] [ height>> pango>float ] bi 2array ] bi
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<rect> ;
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: layout-extents ( layout -- ink-rect logical-rect )
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PangoRectangle <struct>
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PangoRectangle <struct>
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[ pango_layout_get_extents ] 2keep
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[ PangoRectangle>rect ] bi@ ;
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: layout-baseline ( layout -- baseline )
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pango_layout_get_iter &pango_layout_iter_free
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pango_layout_iter_get_baseline
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pango>float ;
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: set-foreground ( cr font -- )
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foreground>> set-source-color ;
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: fill-background ( cr font dim -- )
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[ background>> set-source-color ]
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[ [ { 0 0 } ] dip <rect> fill-rect ] bi-curry* bi ;
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: rect-translate-x ( rect x -- rect' )
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'[ _ 0 2array v- ] change-loc ;
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: first-line ( layout -- line )
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layout>> 0 pango_layout_get_line_readonly ;
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: line-offset>x ( layout n -- x )
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#! n is an index into the UTF8 encoding of the text
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[ drop first-line ] [ swap string>> >utf8-index ] 2bi
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0 0 <int> [ pango_layout_line_index_to_x ] keep
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*int pango>float ;
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: x>line-offset ( layout x -- n )
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#! n is an index into the UTF8 encoding of the text
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[
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[ first-line ] dip
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float>pango 0 <int> 0 <int>
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[ pango_layout_line_x_to_index drop ] 2keep
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[ *int ] bi@ swap
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] [ drop string>> ] 2bi utf8-index> + ;
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: selection-start/end ( selection -- start end )
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selection>> [ start>> ] [ end>> ] bi ;
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: selection-rect ( layout -- rect )
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[ ink-rect>> dim>> ] [ ] [ selection-start/end ] tri [ line-offset>x ] bi-curry@ bi
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[ drop nip 0 2array ] [ swap - swap second 2array ] 3bi <rect> ;
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: fill-selection-background ( cr layout -- )
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dup selection>> [
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[ selection>> color>> set-source-color ]
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[
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[ selection-rect ] [ ink-rect>> loc>> first ] bi
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rect-translate-x
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fill-rect
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] 2bi
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] [ 2drop ] if ;
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: text-position ( layout -- loc )
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[ logical-rect>> ] [ ink-rect>> ] bi [ loc>> ] bi@ v- ;
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: set-text-position ( cr loc -- )
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first2 cairo_move_to ;
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: draw-layout ( layout -- image )
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dup ink-rect>> dim>> [ >fixnum ] map [
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swap {
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[ layout>> pango_cairo_update_layout ]
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[ [ font>> ] [ ink-rect>> dim>> ] bi fill-background ]
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[ fill-selection-background ]
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[ text-position set-text-position ]
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[ font>> set-foreground ]
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[ layout>> pango_cairo_show_layout ]
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} 2cleave
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] make-bitmap-image ;
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: escape-nulls ( str -- str' )
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#! Replace nulls with something else since Pango uses null-terminated
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#! strings
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{ { 0 CHAR: zero-width-no-break-space } } substitute ;
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: unpack-selection ( layout string/selection -- layout )
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dup selection? [
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[ string>> escape-nulls >>string ] [ >>selection ] bi
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] [ escape-nulls >>string ] if ; inline
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: set-layout-resolution ( layout -- )
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pango_layout_get_context dpi get pango_cairo_context_set_resolution ;
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: <PangoLayout> ( text font -- layout )
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dummy-cairo pango_cairo_create_layout |g_object_unref
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[ set-layout-resolution ] keep
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[ set-layout-font ] keep
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[ set-layout-text ] keep ;
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: glyph-height ( font string -- y )
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swap <PangoLayout> &g_object_unref layout-extents drop dim>> second ;
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MEMO: missing-font-metrics ( font -- metrics )
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#! Pango doesn't provide x-height and cap-height but Core Text does, so we
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#! simulate them on Pango.
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[
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[ metrics new ] dip
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[ "x" glyph-height >>x-height ]
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[ "Y" glyph-height >>cap-height ] bi
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] with-destructors ;
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: layout-metrics ( layout -- metrics )
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dup font>> missing-font-metrics clone
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swap
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[ layout>> layout-baseline >>ascent ]
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[ logical-rect>> dim>> [ first >>width ] [ second >>height ] bi ] bi
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dup [ height>> ] [ ascent>> ] bi - >>descent ;
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: <layout> ( font string -- line )
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[
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layout new-disposable
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swap unpack-selection
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swap >>font
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dup [ string>> ] [ font>> ] bi <PangoLayout> >>layout
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dup layout>> layout-extents [ >>ink-rect ] [ >>logical-rect ] bi*
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dup layout-metrics >>metrics
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dup draw-layout >>image
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] with-destructors ;
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M: layout dispose* layout>> g_object_unref ;
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SYMBOL: cached-layouts
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: cached-layout ( font string -- layout )
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cached-layouts get [ <layout> ] 2cache ;
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: cached-line ( font string -- line )
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cached-layout layout>> first-line ;
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SINGLETON: pango-renderer
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M: pango-renderer string-dim
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@ -31,4 +201,10 @@ M: pango-renderer line-metrics ( font string -- metrics )
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[ cached-layout metrics>> ]
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if-empty ;
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[
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\ (cache-font-description) reset-memoized
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<cache-assoc> cached-layouts set-global
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] "ui.text.pango" add-startup-hook
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pango-renderer font-renderer set-global
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